分体串联式电压标准应用于750kV检定车

Series standard voltage transformers for 750kV transformer calibration cart system

为了解决当前750kV电压互感器误差试验存在标准体积庞大、工作任务繁重和安全隐患突出等问题,提出了一种现场检定车研制技术方案。该方案采用串联谐振升压和比较法试验原理,独具特点的是标准电压互感器采用分体串联非标组合式原理,应用工频电压串联加法和分体式结构设计,将上下级电压标准通过高压隔离互感器进行一次和二次串联,能够在满足规定耐压强度和准确度要求的前提下大幅降低设备体积和绝缘要求,而且下级330kV电压标准可单独使用,从而可极大地提高设备利用率。此外还介绍了电容式电压比例标准方法,分析了现场试验环境对该电压标准的影响误差,并通过现场应用实例的试验数据表明,利用检定车开展750kV电压互感器误差检定试验结果与电容式电压比例标准方法的试验结果基本一致,说明本文设计方案的试验结果准确可靠,具备实际应用价值。

In order to solve the problems of huge equipment,workload and security risks in 750 kV Transformer error on-site testing,this paper introduces a new design of 750 kV transformer calibration cart for field test.It uses series resonant boost and comparison method to complete the test,and the most distinctive features of the design is the series standard voltage transformers（SSTV）.SSTV based on the theory of voltage summation method and parted type structures,it can be divided into two stages and be connected by high voltage isolation transformers（HVIT）.This method can greatly reduce the equipment volume and insulation requirements on the premise of meeting the requirements of accuracy and the compressive strength significantly,the bottom is independently used in 330 kV voltage level test and greatly improve the utilization of the equipment.In addition,we introduce the capacitive standard method and the error analysis of the environmental impact of the SSTV.The final practical application example compares the results between the capacitive standard and SSTV,it shows that two results are basically identical,so the transformer calibration cart has the value of practical application.